非均匀等离激元纳米颗粒悬浮液光-热转换特性及调控机制研究

Plasmonic nanoparticle suspensions have excellent solar-thermal conversion performance and are widely used in solar thermal collector, solar thermal catalysis, and distillation. However, the effects of the heterogeneous distribution of particles on the solar-thermal conversion performance of the nanoparticle suspension caused by the two-phase flow and its regulation mechanism need to be improved. Therefore, it is of great significance to conduct research on the two-phase flow and regulation mechanism of heterogeneous plasmonic nanoparticle suspension under the solar-thermal effect. This project takes the heterogeneous plasmonic nanoparticle suspension as the main research object, establishes a model for calculating the spectral absorption of nanoparticle suspensions at non-uniform concentrations, and clarifies the effect of absorption-scattering and non-uniform concentration distribution on the absorption performance of the suspension system. At the molecular scale, the effects of the nanoparticle interface thermal resistance, size, morphology and other parameters on its Brownian motion and thermophoretic motion are considered. Finally, the phase flow heat transfer model is established under the multi-physical fields of solar-thermal-flow to obtain its local particle concentration and the regulation mechanism of solar-thermal conversion performance would be experimentally verified. This work will build a theoretical foundation for the solar-thermal conversion application of nanoparticle suspensions.

等离激元纳米颗粒悬浮液具有较优异的光-热转换性能，广泛应用于太阳能集热、光-热催化及蒸馏等领域。然而，光-热效应下纳米颗粒悬浮液两相流动引起颗粒非均匀分布对体系光-热转换性能的影响与调控机制尚待完善。因此，开展非均匀等离激元纳米颗粒悬浮液光-热转换性能及调控机制研究具有十分重要的意义。本项目以非均匀等离激元纳米颗粒悬浮液为主要研究对象，建立非均匀浓度下纳米颗粒悬浮液光谱吸收计算模型，阐明悬浮液体系中吸收-散射作用规律，获得非均匀浓度分布对体系吸收性能的作用规律；从分子尺度上，分析纳米颗粒界面热阻、尺寸、形貌等参数对其布朗运动及热泳运动的作用规律；建立光-热-流多物理场作用下纳米颗粒悬浮液两相流动传热模型，揭示光-热效应下纳米颗粒悬浮液非均匀分布规律，获得其局部浓度及光-热转换性能调控途径，并通过实验验证其光-热转换性能调控结果，为等离激元纳米颗粒悬浮液在光-热领域的应用奠定理论基础。

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